Shale Barren Bindweed
Calystegia spithamaea (Linnaeus) R. Brown var. stans (Michaux) Brummitt
Shale Barren Bindweed: https://marylandbiodiversity.com/species/17076
Synonyms
Calystegia spithamaea purshiana  Calystegia spithamaea ssp. purshiana  Calystegia spithamaea subsp. stans  Convolvulus spithamaeus  Convovulus purshianus  Upright Bindweed 
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